California crash-injury education · desk no. 02
Every collision has a mechanics. Every injury has a record.
Crashes produce predictable injury patterns — and paperwork that outlasts the pain. This desk explains the mechanics-to-injury chain, what to document, and how California's rules fit the file. No invented numbers, no advice dressed as information.
Call 911 for injuries. This site does not give medical or legal advice.
Fig. 1 — The CHP-555 plate: four impact geometries, restraint marks, and the record panel. Flat schematic, not to scale.
Four facts that cover most of it
Each carries its source. Every topic file expands on these.
Four geometries, four injury patterns
Rear-end, T-bone, head-on, sideswipe: the direction of force decides which structures of the body take the load — and which injuries to expect.
SRC: collision mechanics fileSeatbelts roughly halve fatal-injury risk
NHTSA's long-standing estimate: seatbelts reduce the risk of fatal injury to front-seat occupants by about 45 percent. Airbags add further protection.
SRC: NHTSA; restraint fileMost injury crashes must be reported
A written SR-1 report to the DMV is due within 10 days when a collision involves injury, death, or damage above the statutory threshold (Vehicle Code §20008).
SRC: reporting fileTwo years to file a lawsuit
Personal-injury lawsuits must generally be filed within two years of the injury under Code of Civil Procedure §335.1.
SRC: claims fileTopics, in reading order
A ledger, not a blog. Start with the record and the rules, then the mechanics-to-injury chain, and end with the claims frame — each file stands alone, each links to the next logical one.
The record is the injury's second life
Crash injuries live in records: the crash record, the medical record, the loss record, and your own dated notes. The documentation gap is where valid injuries get lost.
Fig. 2 — The four-part evidence file
- Crash record — the police or CHP report, the scene photos, and the SR-1 filed with the DMV within 10 days where the statute requires it (Vehicle Code §20008).
- Medical record — exam notes and imaging made week by week, starting with the first evaluation.
- Loss record — missed work and out-of-pocket costs, with the stubs that prove them.
- Statement record — your own dated notes on what hurts and how it limits you. Memory fades; a dated note does not.
Every collision is a physics problem with a body in it
Speed, direction, and delta-v — the vehicle's change in velocity — decide how the body gets loaded. Geometry decides which structures take it.
A rear-end shove accelerates the torso and leaves the head behind. A T-bone puts the door — a few inches of structure — between the impact and the occupant. A head-on adds both vehicles' energy into one crush. A sideswipe loads the body laterally and often sets up a worse second event.
Delta-v is the quantity the body experiences: the vehicle's change in velocity over the crash pulse. The greater the delta-v, the greater the loading — and the crash record is where that quantity gets measured, not guessed.
The full mechanics file →The dates that structure a California claim
Three statutory anchors organize everything downstream of a crash. Each is stated in the code, not estimated.
The SR-1 report
A written report to the DMV is due within 10 days when a collision involves injury, death, or property damage above the statutory threshold (Vehicle Code §20008).
The statute of limitations
A personal-injury lawsuit must generally be filed within two years of the injury (Code of Civil Procedure §335.1).
The SB 1107 minimums
For policies issued or renewed on or after January 1, 2025: $30,000 bodily injury per person, $60,000 per accident, $15,000 property damage.
Editorial standards, stated plainly
This is a reference publication. What that commits us to — and what it rules out.
Every claim carries a source
Statutory and medical statements map to public primary sources, listed at the foot of each file. No invented statistics, averages, or anecdotes.
No one sponsors a word
No advertising, no referrals, no affiliate links, no paid placement. The desk has no client to please.
Errors get fixed on the record
Corrections policy and editorial method are published on the About page.